Mistype , -> .

Author: Justin Baum

Lib/test/test_doctest.py

@@ -1315,7 +1315,7 @@ def optionflags(): r"""
     [0,    1, ...,   18,    19]
 
 The IGNORE_CASE flag causes the test runner to ignore case when
-matching the expected output to the actual output,
+matching the expected output to the actual output.
     >>> print("Hello World") # doctest: +IGNORE_CASE
     hello world